#include <stdio.h>
#include <string.h>
#include <ctype.h>

int main (int argc, char *argv[])
{
    int c;

    if (strcmp (argv[0], "./lower") == 0)
        while ((c = getchar()) != EOF)
            putchar (tolower(c));
    else
        while ((c = getchar()) != EOF)
            putchar (toupper (c));

    return 0;
}

